1、Introduction：Flange is a connection between the shafts, it is used for the connection between the pipe ends.

2、According to the national (GB) standard: It can be divided into intergral flange, thread flange, butt welding neck flange, flat welding flange, socket welding neck flange, butt welding ring neck loose flange, plate flat welding flange, butt welding ring plate loose flange, flat welding ring plate loose flange, lap joint plate loose flange, blind flange. According to the petrochemical (SH) industry standard: it can be divided into SO flange, WN flange, BL flange, PT flange, SW flange and LJ flange.

3、Applications: Boiler and pressure vessels, petroleum, chemical, shipbuilding, pharmaceutical, metallurgy, machinery, food and other industries.

Carbon steel flange:

Nominal diameter：DN10-DN2000 
Sealing face：Flat face (FF)、Raised face (RF)、MFM、TG、RJ
Flange standard： ANSI（ANSI B16.5，ANSI B16.47，MSS SP44，ANSI B16.36，ANSI B16.48）、BS、DIN、JIS、EN、UNI 、HG、JB、GB
Flange material：ASTM A105, 20#、Q235、16Mn、 ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2、ASTM A694 F42, F46,F48, F50, F52, F56, F60, F65, F70
Flange pressure：
GB: PN0.25, PN1.0, PN1.6, PN2.5, PN4.0, PN5.0
DIN/BS/UNI/EN:  6 BAR，10 BAR，16 BAR，25BAR，40 BAR
DIN/BS/UNI/EN:  PN6, PN10, PN16, PN25, PN40
ANSI: 150#, 300#, 400#, 600#, 900#,1500#, 2500#     
JIS: JIS 5K, 10K, 16K, 20K,  30K, 40K
Surface treatment：hot dip galvanized, electro galvanized, black painting, rust-proof oil or epoxy coating

Stainless steel flange:

Nominal diameter：DN10-DN2000
Sealing face：Flat face (FF)、Raised face (RF)、 MFM、TG、RJ
Flange standard：ANSI（ANSI B16.5，ANSI B16.47，MSS SP44，ANSI B16.36，ANSI B16.48）、BS、DIN、JIS、EN、UNI 、HG、JB、GB
Flange material：ASTM A182 F304、304L、 F316、316L、1Cr18Ni9Ti、0Cr18Ni9Ti、321、18-8
Flange pressure：
GB: PN0.25, PN1.0, PN1.6, PN2.5, PN4.0, PN5.0
DIN/BS/UNI/EN:  6 BAR，10 BAR，16 BAR，25BAR，40 BAR
DIN/BS/UNI/EN:  PN6, PN10, PN16, PN25, PN40
ANSI: 150#, 300#, 400#, 600#, 900#,1500#, 2500#     
JIS: JIS 5K, 10K, 16K, 20K,  30K, 40K
Surface treatment：hot dip galvanized, electro galvanized, black painting, rust-proof oil or epoxy coating